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So I have this given data:

year = [1928:4:1936 1948:4:1956 1964:4:2000];

time = [12.2 11.9 11.5 11.9 11.5 11.5 11.4 11.08 11.07 11.08 11.06 10.97 10.54 10.82 10.94 10.75];

and after plotting it (time vs. year), I am told to find the best first order least squares fit to the data by a line using the polyfit function.

I am then told to find the root mean square error in this line and then plotting that best line?

How would I go about doing this?

When I did this, I used the function Fit1=polyfit(year, time, 1);

Fit1 came out to equal -0.0185 47.6837 which, when plotted on the same graph as the original data resembled nothing like it.

What am I doing wrong?

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# Matlab and Root Mean Square help

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